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Ensuring Additional Mechanical Protection of HDD Coatings

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As onshore pipeline rights-of-way become more congested and urban sprawl increases, the number of horizontal directional drills (HDDs) will likely increase. HDD is a trenchless pipeline installation method that requires drilling a larger pilot hole where the mainline pipe can be subsequently pulled through the drilled hole. However, HDDs have an increased probability for coating damage, even when coated with traditional mill or field applied abrasion resistant overcoat (ARO).

Product Number: 51323-19549-SG
Author: David B. Futch, Ron Raphoon
Publication Date: 2023
$20.00
$20.00
$20.00

The use of horizontal directional drills (HDDs) is an ever-increasing pipeline installation technique. As HDDs increase, there is an increased probability for coating damage, even when coated with traditional mill or field applied abrasion resistant overcoat (ARO). This coating damage includes shear, abrasion, impact, and gouging (SAIG) (among others) and that damage may exist for the life of the pipeline due to an HDD being inaccessible for future maintenance. Ensuring the long-term quality and performance of the coating applied to pipe within an HDD is critical for the life of the asset.


Current subscale tests provide a good starting point for the ability of any given coating to provide protection from obstructions within an HDD, however, those test protocols do not currently assure or quantify additional mechanical protection currently mentioned in several ASME and ISO specifications. Therefore, there remains a need for a full-scale test alternative to provide qualitative shear, abrasion, impact, and gouging data for any given coating to be used in an HDD. The developed full-scale test alternative includes several features or obstructions that are engaged against the pipe/coating while mechanically pulling the pipe through the test cage. These features were designed to replicate the loading experienced within an HDD.


The result of this test helps quantify the damage experienced. This is done through several quantitative assessments including holiday detection, gouge depth measurements, and shear disbondment. These results are then benchmarked against several commonly used mill applied coatings.

The use of horizontal directional drills (HDDs) is an ever-increasing pipeline installation technique. As HDDs increase, there is an increased probability for coating damage, even when coated with traditional mill or field applied abrasion resistant overcoat (ARO). This coating damage includes shear, abrasion, impact, and gouging (SAIG) (among others) and that damage may exist for the life of the pipeline due to an HDD being inaccessible for future maintenance. Ensuring the long-term quality and performance of the coating applied to pipe within an HDD is critical for the life of the asset.


Current subscale tests provide a good starting point for the ability of any given coating to provide protection from obstructions within an HDD, however, those test protocols do not currently assure or quantify additional mechanical protection currently mentioned in several ASME and ISO specifications. Therefore, there remains a need for a full-scale test alternative to provide qualitative shear, abrasion, impact, and gouging data for any given coating to be used in an HDD. The developed full-scale test alternative includes several features or obstructions that are engaged against the pipe/coating while mechanically pulling the pipe through the test cage. These features were designed to replicate the loading experienced within an HDD.


The result of this test helps quantify the damage experienced. This is done through several quantitative assessments including holiday detection, gouge depth measurements, and shear disbondment. These results are then benchmarked against several commonly used mill applied coatings.

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Horizontal directional drills (HDD) have become an essential pipeline construction tool for crossing spans of the right of way with obstructions such as wetlands, rivers and streams, railroads, roads, businesses, and high consequence areas (HCA). This trenchless technology allows a pipeline to be installed without open cutting the ground. Prior to any construction, geological surveys with core samples are performed to determine the optimum route for the HDD (Figure 1).
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In the recent years, Horizontal Directional Drilling - HDD - became a real improvement for pipeline construction when crossing obstacles such as rivers, roads or railways. For the corrosion protection of the carbon steel pipeline, a protective coating is associated with cathodic protection. But for trenchless techniques, the coating shall withstand the stresses from the installation. Several standards are used to specify corrosion protection coatings for buried pipelines but those documents do not cover the specific conditions of an HDD.
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